<?php

declare(strict_types=1);

namespace SPC\builder;

use SPC\exception\FileSystemException;
use SPC\exception\RuntimeException;
use SPC\exception\WrongUsageException;
use SPC\store\Config;
use SPC\store\FileSystem;
use SPC\store\SourceExtractor;
use SPC\util\CustomExt;
use SPC\util\DependencyUtil;

abstract class BuilderBase
{
    /** @var int Concurrency */
    public int $concurrency = 1;

    /** @var array<string, LibraryBase> libraries */
    protected array $libs = [];

    /** @var array<string, Extension> extensions */
    protected array $exts = [];

    /** @var bool compile libs only (just mark it) */
    protected bool $libs_only = false;

    /** @var array<string, mixed> compile options */
    protected array $options = [];

    /**
     * Build libraries
     *
     * @param  array<string>       $libraries Libraries to build
     * @throws FileSystemException
     * @throws RuntimeException
     * @throws WrongUsageException
     */
    public function buildLibs(array $libraries): void
    {
        // search all supported libs
        $support_lib_list = [];
        $classes = FileSystem::getClassesPsr4(
            ROOT_DIR . '/src/SPC/builder/' . osfamily2dir() . '/library',
            'SPC\\builder\\' . osfamily2dir() . '\\library'
        );
        foreach ($classes as $class) {
            if (defined($class . '::NAME') && $class::NAME !== 'unknown' && Config::getLib($class::NAME) !== null) {
                $support_lib_list[$class::NAME] = $class;
            }
        }

        // if no libs specified, compile all supported libs
        if ($libraries === [] && $this->isLibsOnly()) {
            $libraries = array_keys($support_lib_list);
        }

        // pkg-config must be compiled first, whether it is specified or not
        if (!in_array('pkg-config', $libraries)) {
            array_unshift($libraries, 'pkg-config');
        }

        // append dependencies
        $libraries = DependencyUtil::getLibsByDeps($libraries);

        // add lib object for builder
        foreach ($libraries as $library) {
            // if some libs are not supported (but in config "lib.json", throw exception)
            if (!isset($support_lib_list[$library])) {
                throw new RuntimeException('library [' . $library . '] is in the lib.json list but not supported to compile, but in the future I will support it!');
            }
            $lib = new ($support_lib_list[$library])($this);
            $this->addLib($lib);
        }

        // calculate and check dependencies
        foreach ($this->libs as $lib) {
            $lib->calcDependency();
        }

        // extract sources
        SourceExtractor::initSource(libs: $libraries);

        // build all libs
        foreach ($this->libs as $lib) {
            match ($lib->tryBuild($this->getOption('rebuild', false))) {
                BUILD_STATUS_OK => logger()->info('lib [' . $lib::NAME . '] build success'),
                BUILD_STATUS_ALREADY => logger()->notice('lib [' . $lib::NAME . '] already built'),
                BUILD_STATUS_FAILED => logger()->error('lib [' . $lib::NAME . '] build failed'),
                default => logger()->warning('lib [' . $lib::NAME . '] build status unknown'),
            };
        }
    }

    /**
     * Add library to build.
     *
     * @param LibraryBase $library Library object
     */
    public function addLib(LibraryBase $library): void
    {
        $this->libs[$library::NAME] = $library;
    }

    /**
     * Get library object by name.
     */
    public function getLib(string $name): ?LibraryBase
    {
        return $this->libs[$name] ?? null;
    }

    /**
     * Add extension to build.
     */
    public function addExt(Extension $extension): void
    {
        $this->exts[$extension->getName()] = $extension;
    }

    /**
     * Get extension object by name.
     */
    public function getExt(string $name): ?Extension
    {
        return $this->exts[$name] ?? null;
    }

    /**
     * Get all extension objects.
     *
     * @return Extension[]
     */
    public function getExts(): array
    {
        return $this->exts;
    }

    /**
     * Check if there is a cpp extension.
     *
     * @throws FileSystemException
     * @throws WrongUsageException
     */
    public function hasCppExtension(): bool
    {
        // judge cpp-extension
        $exts = array_keys($this->getExts());
        $cpp = false;
        foreach ($exts as $ext) {
            if (Config::getExt($ext, 'cpp-extension', false) === true) {
                $cpp = true;
                break;
            }
        }
        return $cpp;
    }

    /**
     * Set libs only mode.
     */
    public function setLibsOnly(bool $status = true): void
    {
        $this->libs_only = $status;
    }

    /**
     * Verify the list of "ext" extensions for validity and declare an Extension object to check the dependencies of the extensions.
     *
     * @throws FileSystemException
     * @throws RuntimeException
     * @throws \ReflectionException
     * @throws WrongUsageException
     */
    public function proveExts(array $extensions): void
    {
        CustomExt::loadCustomExt();
        SourceExtractor::initSource(sources: ['php-src']);
        if ($this->getPHPVersionID() >= 80000) {
            SourceExtractor::initSource(sources: ['micro']);
        }
        SourceExtractor::initSource(exts: $extensions);
        foreach ($extensions as $extension) {
            $class = CustomExt::getExtClass($extension);
            $ext = new $class($extension, $this);
            $this->addExt($ext);
        }

        foreach ($this->exts as $ext) {
            $ext->checkDependency();
        }
    }

    /**
     * Start to build PHP
     *
     * @param int $build_target Build target, see BUILD_TARGET_*
     */
    abstract public function buildPHP(int $build_target = BUILD_TARGET_NONE);

    /**
     * Generate extension enable arguments for configure.
     * e.g. --enable-mbstring
     *
     * @throws FileSystemException
     * @throws WrongUsageException
     */
    public function makeExtensionArgs(): string
    {
        $ret = [];
        foreach ($this->exts as $ext) {
            $ret[] = trim($ext->getConfigureArg());
        }
        logger()->info('Using configure: ' . implode(' ', $ret));
        return implode(' ', $ret);
    }

    /**
     * Get libs only mode.
     */
    public function isLibsOnly(): bool
    {
        return $this->libs_only;
    }

    /**
     * Get PHP Version ID from php-src/main/php_version.h
     */
    public function getPHPVersionID(): int
    {
        $file = file_get_contents(SOURCE_PATH . '/php-src/main/php_version.h');
        preg_match('/PHP_VERSION_ID (\d+)/', $file, $match);
        return intval($match[1]);
    }

    /**
     * Get build type name string to display.
     *
     * @param int $type Build target type
     */
    public function getBuildTypeName(int $type): string
    {
        $ls = [];
        if (($type & BUILD_TARGET_CLI) === BUILD_TARGET_CLI) {
            $ls[] = 'cli';
        }
        if (($type & BUILD_TARGET_MICRO) === BUILD_TARGET_MICRO) {
            $ls[] = 'micro';
        }
        if (($type & BUILD_TARGET_FPM) === BUILD_TARGET_FPM) {
            $ls[] = 'fpm';
        }
        return implode(', ', $ls);
    }

    /**
     * Get builder options (maybe changed by user)
     *
     * @param string $key     Option key
     * @param mixed  $default If not exists, return this value
     */
    public function getOption(string $key, mixed $default = null): mixed
    {
        return $this->options[$key] ?? $default;
    }

    /**
     * Get all builder options
     */
    public function getOptions(): array
    {
        return $this->options;
    }

    /**
     * Set builder options if not exists.
     */
    public function setOptionIfNotExist(string $key, mixed $value): void
    {
        if (!isset($this->options[$key])) {
            $this->options[$key] = $value;
        }
    }

    /**
     * Set builder options.
     */
    public function setOption(string $key, mixed $value): void
    {
        $this->options[$key] = $value;
    }

    /**
     * Check if all libs are downloaded.
     * If not, throw exception.
     *
     * @throws RuntimeException
     */
    protected function checkLibsSource(): void
    {
        $not_downloaded = [];
        foreach ($this->libs as $lib) {
            if (!file_exists($lib->getSourceDir())) {
                $not_downloaded[] = $lib::NAME;
            }
        }
        if ($not_downloaded !== []) {
            throw new RuntimeException(
                '"' . implode(', ', $not_downloaded) .
                '" totally ' . count($not_downloaded) .
                ' source' . (count($not_downloaded) === 1 ? '' : 's') .
                ' not downloaded, maybe you need to "fetch" ' . (count($not_downloaded) === 1 ? 'it' : 'them') . ' first?'
            );
        }
    }
}